$ git clone -n https://src.fedoraproject.org/rpms/plexus-velocity.git /var/lib/mock/f40-build-2213250-52316/root/chroot_tmpdir/scmroot/plexus-velocity
Cloning into '/var/lib/mock/f40-build-2213250-52316/root/chroot_tmpdir/scmroot/plexus-velocity'...
$ git fetch origin c2569d1f826e4cf4b61c8b7bbd654aa8d5d8e211:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-velocity
 * [new ref]         c2569d1f826e4cf4b61c8b7bbd654aa8d5d8e211 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2569d1 Update sources/lookaside cache